president obama did something today he didn't do yesterday. he called it an act of terrorism. >> this was a heinous and cowardly act, and given what we now know about what took place, the fbi is investigating it as an act of terrorism. any time bombs are used to target innocent civilians, it is an act of terror. >> well, there's still so much we don't know. who did this? no one knows. why? was it an act of domestic terrorism or foreign? was this the work of an individual or a group of people? despite the stepped up police presence at the site, despite the advanced frenzices used by the investigators, despite all the cell phones we're using, all those videos out there, there's no guarantee who is responsible for this will be discovered any time soon. it took nearly two years, let's remember, for the fbi to locate and arrest the unabomber, two decades, rather. the unabbomber. let's begin this hour with former cia counterterrorism director, larry johnson. your thoughts about this kind of challenge and the working relationships among the various a